Motor-cycle frame.



Y C. 0. HEDSTROM.

MOTOR CYCLE FRAME.

APPLICATION FILED MAE. 7, 1914. 1 1 1 1 1 52.

Patented Sept 22, 1914.

W1 TNESSESJ. IN VEN TOR. Q 621$ afzazisfiom A TOR NE W THE NORRIS PEYERSCQ, FHOTO-LITHQ. WASHINGTON D cv CARL o. HEDS'I'ROM, or PORTLAND,CONNECTICUT.

MOTOR-CYCLE FRAME.

Specification of Letters Patent.

Patented Sept. 22, 1914.

Application filed March 7, 1914. Serial No. 823,139.

To all whom it may concern) Be it known that I, CARL O. HEDsTRoM,residingin Portland, county of Middlesex, andState of Connecticut, haveinvented certain new and tor-Cycle Frames, ofwhich the following is the.specification. i 1 his invention relatesfto' improvements in motorcycleframes and anobject is to proylde a construction in which therear wheelis permitted to have free and unrestricted vertical movements.

Heretofore, I in motorcycle construction it hasbeen the common practiceto form the 'rear" 'portion' of the supporting springs,

which are interposed'between the rear axle" and the frame withshortcurves or bends therein. This practice has been found obage of theon account ofthe large percentbreakages of the springs which occur, andit able because the springs did not yield or belIld otlrler their entirelength when in use.

jectionable Eplated'to use plate springs located between the rear axleand the framework. These springs are pivotally attached at their cen terportions to aportion ofthe main frame which extends rearwardly from thesaddle post, whereby the springs may turn about" posite ends of thesprings will be flexed or ent; in; opposite directions. 2

The single figure, in perspective, shows t e improvement, and in dottedlines the position the parts assume when the rear wheel passes over anelevation in the roadway. I

Referring to the drawings in detail 1 main frame work of the madesignates the chine, 2 a rigid post extending upwardly from thecrank-hanger construction to the yoke block 3 with which it isintegrally formed.

4 designates the usual members which extend rearwardly from thecrank-hanger and to which they arepivotally connected to the main frameas indicatedat 5. 6 are posts that are pivotally connected to the usefulImprovements in Mo-- has also been found objectione present invention itis conteme a construction permits the the springs 'to be used, as willbe fully described, and whereby the op rear axle forks 7, at the points8. The upper ends of these posts are pivotally attached to the lowerleaves 9 of the plate springs 10, asshown at 10 to the post 1 by meansofthe opposltely disposed links 11 at the points 12, the upper ends ofthe links 11 being pivotally attached to the main framel at 13. Mountedon the springs 10, near their middleportions are pivot blocks 14;. Theseblocks are rigidly secured to the plate springs 10 by means of theclamps15 Pivotally attached to the blocks 14 is the rigid :yoke member 3 asindicated at the points 15. This -yoke member extends forward asindicated at 16 and is formed with a boss'or projection 17 on whichrests and is secure the saddle of the vehicle in the usual manner. Theusual upper and lowerfbrace bars of the vehicle are shown at 17 and 17 1Referring now to the operation of the machine, it will be seen'that theframe and plate springs10, should the vehicle pass over an elevation inthe roadway, will assume the dotted line positions shown. The rear axlewhich is connected to the forks 7 would be thrown upward, carryingtherear ends of the springs 10 in thi Cause "the springs to turn aboutthe fixed The forward. ends of these springs are pivotally attached sdirection which would.

pivot points 15. The links 11 would assume p the dotted line position 11by turning upon their pivots 18. By means of this construction the fulllength of the plate springs 10 would be brought into use, and, as thereare no sharp turns or bends in these springs they wouldnot be so liableto break as those in common use in which a' short loop is formed at theends through which the usual pivot pins pass, the'break, as well known,occurring at these short loops.

The parts 1, 16 and 3 are rigidly connected together. The parts 4, 6,springs 10,and the "links 11 constitute a movable frame work by means ofwhich the rear wheel can move freelyin a vertical plane. The springs 10will automatically move either upward or downward about the fixed pivotpoints 15 according to whether the wheels fall into a depression, orpass over an elevation in the roadway. Should the rear wheel, indicatedin dotted line, drop into a depression, the springs 10 would be flexedor bent in the opposite direction to that shown, the rear ends of thespring would then move downward and the forv the pivots 12 and,

. a rearwardly extending ward ends would move slightly upward by reasonof the link connections 11. The links 11 must be provided in for theforward movements of the springs which necessarily move through an are 0a circle When the rear axle of the vehicle drops into a depression,carrying the rear end of the springs 10 downward, and moving the forwardends of the-spring upward, the links will then move a very slightainount, because the forces. on the links 11 main frame, means to.attach the rear end rearw ardly extending of the springto the blockrigidly secured fork of the vehicle, a

' tonft'he.center portion of the spring, a yokeniember forming 'a partof the main frame andpivotally attached to said block, where by whenthevehicle passes through a depression or' over an elevation in the'road way, the spring will rotatev about the yoke member .and .theopposite .endsof. the spring.

will be flexed in. opposite directions, as de scr bed. i

2.111 a motorcycle,

the. main frame, of.

tached, thereto and v.jxtending rearwardly thereof, posts secured. to'the rear end of said fork and pivotally attached to the main. frame,springs secured to the links. andposts respectively, a. portion of theframe being pivotally attached to the. center portions of the springs,wherebywhen the vehicle is in use, the full length of the springs will ibe, flexed, and thejoppositev ends of said springs will be moved inopposite direc tions, as described. 3. A motorcycle frame comprlsing incombination, a fork pivotally connected to the Copies of this patent mayt5 obtained for five cents eaten-by; addressing the Washington, I). 0.,i

order to compensate the; combination with: a fork. pivotally'atextending 3 upwardly,; links frame, a post device secured to the rearend of the fork, a movable-link member secured to the said frame, aspring member attached at its opposite ends to said post device and saidmovable link member respectively, and a pivotal connection'between thecenter portion of the spring and the frame.

4;. The combination with the main frame of a machine of the classdescribed,a rear-- wardly extending fork pivotally connected to the mainframe, I pivotally attachedtothe post secured .to said',fork,.saidspring; being attached to the post, and link respectively,

mam-A rt m a and means for pivotally securingthe cen;'

r. p r w th se ies-r e main; r m whereb the, full lengthof parted; to,the pivotally conn'e'ctedrejar fork,.

as 7 described.

M :5 mm? Th ombi a i n. th tha r m w of a" motorcycle i or. .si1nilar Amachine,

ing ,rearwardly extending yol e ,pprtion formlng a part ,of the,framework, a rear fork, .pivotally connected to the. framework,

in which ,the rear axle of the vehicle m u ed, a spr n ppo and fork:respectively, and ,means to piv otal ly conneetpthe center portion. ofthe spring with said yoke,

of, .a motor-yehicle, a frear fork pivotedf te, the fnamework,. a link;connected lto the framework, a post i spring pivotally connected ,at oneen wi h atv the. other-with the post,

the ,link and tion or the springto 7. A, motorcycle frame,

means. to .pivotally,..secure the 1eentertpor-v iths. me rks! naesatn-ea va r'ea r forknp'ive otally I otally attached, to

he r ar a e "a e-Sprint and of .a.. p m' slink.

v the sw rls wil be -when v r c -mqt m tsam int-.-

P .1 11: 6.' The combination with ,tlie ..framew' orfk having ;a pivotalconnectionwith menial; 1

and post, and means topivotally; machete frame.

Witnesses; HARRY Bowen,

E. HARTWEI Commissioner "of Petent i er portion of thefsprmg to the saidone; o. e s an.

